“May the stars shine down on you.”
Okay, let's put Rosalina's description here shall we:
Rosalina (Rosetta in Japan) is a character in the Mario series who made her first appearance in Super Mario Galaxy for the Wii. She is the motherly and very beautiful protector of the Luma creatures in the game, and can be found in the Comet Observatory, or hub, the main hub in Super Mario Galaxy, where she needs Mario's help. When the game was being developed, the creators were originally going to make Rosalina related to Peach in some way, but ultimately decided against it. Speculations on the internet have also tried to link Peach to Rosalina by suggesting that Peach is Rosalina's Mother since the depiction of Rosalina's mother in Rosalina's Storybook resembles Peach. None of these speculations have been considered canon. The developers told the character's back story through a book in the Comet Observatory's library.
“I will watch you from beyond the stars.”